package cn.dw.utils;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public class BufferedImageLuminanceSource extends LuminanceSource {
	private final BufferedImage image;
	private final int left;
	private final int top;

	public BufferedImageLuminanceSource(BufferedImage image) {
		this(image, 0, 0, image.getWidth(), image.getHeight());
	}

	public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
		super(width, height);

		int sourceWidth = image.getWidth();
		int sourceHeight = image.getHeight();
		if ((left + width > sourceWidth) || (top + height > sourceHeight)) {
			throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
		}
		for (int y = top; y < top + height; y++) {
			for (int x = left; x < left + width; x++) {
				if ((image.getRGB(x, y) & 0xFF000000) == 0) {
					image.setRGB(x, y, -1);
				}
			}
		}
		this.image = new BufferedImage(sourceWidth, sourceHeight, 10);
		this.image.getGraphics().drawImage(image, 0, 0, null);
		this.left = left;
		this.top = top;
	}

	public byte[] getRow(int y, byte[] row) {
		if ((y < 0) || (y >= getHeight())) {
			throw new IllegalArgumentException("Requested row is outside the image: " + y);
		}
		int width = getWidth();
		if ((row == null) || (row.length < width)) {
			row = new byte[width];
		}
		this.image.getRaster().getDataElements(this.left, this.top + y, width, 1, row);
		return row;
	}

	public byte[] getMatrix() {
		int width = getWidth();
		int height = getHeight();
		int area = width * height;
		byte[] matrix = new byte[area];
		this.image.getRaster().getDataElements(this.left, this.top, width, height, matrix);
		return matrix;
	}

	public boolean isCropSupported() {
		return true;
	}

	public LuminanceSource crop(int left, int top, int width, int height) {
		return new BufferedImageLuminanceSource(this.image, this.left + left, this.top + top, width, height);
	}

	public boolean isRotateSupported() {
		return true;
	}

	public LuminanceSource rotateCounterClockwise() {
		int sourceWidth = this.image.getWidth();
		int sourceHeight = this.image.getHeight();
		AffineTransform transform = new AffineTransform(0.0D, -1.0D, 1.0D, 0.0D, 0.0D, sourceWidth);
		BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, 10);
		Graphics2D g = rotatedImage.createGraphics();
		g.drawImage(this.image, transform, null);
		g.dispose();
		int width = getWidth();
		return new BufferedImageLuminanceSource(rotatedImage, this.top, sourceWidth - (this.left + width), getHeight(),
				width);
	}
}
